IshGen 121:4 :ܛܘܦܢܐ ܕܝܢ ܡ݂ܢ ܩܝܛܐ ܫܪܝ ܕܠܐ ܢܣܬܒܪ ܕܓܕܫܢܐܝܬ ܗܘ݂ܐ‏ : the Deluge started in the summer so that it would not be claimed that it was by chance
See the entire entry for gedšānāˀīṯ adv. by chance